New software tools for REBOUND n-body simulations

We present new tools for the REBOUND n-body integrator. These tools include modules that add: collision fragmentation, chemical tracking of particles, time-dependent stellar evolution, and the Yarkovsky effect. Some of these tools are incorporated directly into the REBOUNDx extension library while others are used in post-processing of simulation data. These new tools will be useful for a variety of studies of planet formation and dynamical evolution. They can also be generalized to model other time-dependent system properties or other physical properties of the particles in the simulations.